This paper presents recent experimental results that clearly demonstrate the complex interplay between parametric instabilities in a laser-produced plasma. These results include: (a) the interplay between ion acoustic waves (IAW) and electron plasma waves (EPW) associated with stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS), (b) the interplay between IAW from two independent SBS decays when two interaction beams are present and (c) the observation of a secondary process, the Langmuir decay instability (LDI), which is the further decay of EPWs driven by SRS, into an IAW and a secondary EPW.